<!doctype html>
<html lang="zh-CN">
  <head>
    <!-- 必须的 meta 标签 -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

    <!-- Bootstrap 的 CSS 文件 -->
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/css/bootstrap.min.css" crossorigin="anonymous">
    <title>表单</title>
    <style>
        .btn{
            width: 200px;
        }

    </style>
  </head>
  <body>
    <nav class="navbar navbar-expand-lg navbar-primary bg-primary">
        <a style="color: white;" class="navbar-brand" href="#">首页</a>
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
          <span class="navbar-toggler-icon"></span>
        </button>
        <div class="collapse navbar-collapse justify-content-end" id="navbarSupportedContent">
          <ul class="navbar-nav mr-auto">
            <li class="nav-item active">
              <a style="color: white;" class="nav-link" href="#">我的 <span class="sr-only">(current)</span></a>
            </li>
            <li class="nav-item">
              <a style="color: whitesmoke;" class="nav-link" href="#">设置</a>
            </li>
            <li class="nav-item dropdown">
              <a style="color: white;" class="nav-link dropdown-toggle" href="#" role="button" data-toggle="dropdown" aria-expanded="false">
                更多
              </a>
              <div class="dropdown-menu">
                <a class="dropdown-item" href="#">Action</a>
                <a class="dropdown-item" href="#">Another action</a>
                <div class="dropdown-divider"></div>
                <a class="dropdown-item" href="#">Something else here</a>
              </div>
            </li>
            <li class="nav-item">
              <a style="color: white;" class="nav-link disabled">退出</a>
            </li>
          </ul>
        </div>
      </nav>
      <!-- 账号，密码 -->
      <form>
        <div class="form-group">
          <label style="margin-left: 25px;" for="exampleInputEmail1">账号</label>
          <input style="width: 1200px; margin-left: 25px;" type="email" class="form-control" id="exampleInputEmail1" aria-describedby="emailHelp" placeholder="请输入账号">
        </div>
        <div class="form-group">
          <label style="margin-left: 25px;" for="exampleInputPassword1">密码</label>
          <input style="width: 1200px; margin-left: 25px;" type="password" class="form-control" id="exampleInputPassword1" placeholder="请输入密码">
        </div>
      </form>

      <!-- 选择登录 -->
      <div class="dropdown">
        <p style="margin-left: 25px;">选择登录</p>
        <button style="margin-left: 25px;"class="btn btn-outline-dark dropdown-toggle my-2 my-sm-0" type="button" data-toggle="dropdown" aria-expanded="false"> 
        移动登入
        </button>
        <div class="dropdown-menu">
          <a class="dropdown-item" href="#">手动登入</a>
          <a class="dropdown-item" href="#">电信登入</a>
          <a class="dropdown-item" href="#">其他登入</a>
        </div>
      </div>
      <br>
      <!-- 按钮 -->
      <button style="width: 60px; height: 40px; margin-left: 25px;" type="button" class="btn btn-primary">登入</button>

      </div>
    <script src="https://cdn.jsdelivr.net/npm/jquery@3.5.1/dist/jquery.slim.min.js" crossorigin="anonymous"></script>
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/js/bootstrap.bundle.min.js" crossorigin="anonymous"></script>
  </body>
</html>